That's not a bad build. Fairly dexy. You could easily take dex to 40 and then have a bash at endurance + vit. Probably need it for NG+

When you kill the last boss on ng, you'll choose an ending and then you'll immediately be back in the nexus again, with all npc's reset, along with doors shut etc etc. The game is now 40% harder. Second chance miracle is now pretty much a necessary miracle. And I swear the monsters are more aggressive.

Nope, you stay the same, with all weapons, gear, upgrades etc. And believe me, you'll need them

This is from the wiki, but it's not spoilery -

What will be carried over

The following items will carry over from one NG lifecycle to the subsequent NG lifecycle (e.g. from NG+ to NG++)

All Consumables and Upgrade Stones. This includes Eye Stones, which enables you to summon phantoms in 1-1
All Demon's Souls
All Weapons, Armor and Shields
All Miracles and Spells, your memorized ones will also remain the same
World Tendency
Character Tendency
Soul Level and Stats
Worlds 1-3, 1-4 and False King will be accessible without defeating any Archdemons (after completing 1-1 and 1-2, however)
The items mentioned above include those stored with Stockpile Thomas.

What will not be carried over

All NPCs will reset to their default position, this includes all who have died for whatever reason.
All Keys will reset to their default position.
All doors and unlockable areas will reset.
Note: If you have the World Tendency requirement to open an area such as the execution grounds in 1-1 (Where Miralda is) when you complete the game, upon starting NG+ you will find that area open already. Although the door will have shut when you finished the game, the game will take into account your WT upon starting NG+ and will unlock/open any areas as normal.

Well I haven't got too far to go with Demon's Souls by the sounds of it. But I'm not sure whether I should move on to Dark Souls or start a couple or Chars on Demon's. Was thinking one for PB WT and one for PW.

@robc84
The separate builds for tendency events isn't required ,you can change WT back and forth very easily in same playthrough even when staying online. It might be worth staying with the same build you have and mopping up any trophies and completing stuff you may of missed.

I also heard it's a pain to go from PW to PB and vice versa. What I may do is go for maybe a PW in NG+ (as that makes things slightly easier right?), then set up another char for PB. I'm thinking maybe a strength build.